| When a solid is made up of a pure substance and forms slowly, it can become a crystal. |
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| The term extinction coefficients describes the absorbance spectra of a single pure substance at known concentrations. |
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| At the thermodynamic equilibrium the vapour pressure of a pure substance is a function of temperature only. |
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| What criterion at the microscopic level is used to decide if a substance X is a pure substance? |
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| The chemical makeup of most minerals is not as well defined as that of quartz, which is a pure substance. |
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| Mephedrone is sold as the pure substance, so users know what they are getting. |
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| An ionic compound can also be a pure substance, but must contain not more than three different species of ion in a ratio expressible in single digits. |
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| The solid phase of a pure substance is usually crystalline, having the atoms or molecules arranged in a regular pattern so that a suitable small sample may define the whole. |
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| Molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance. |
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| A questionnaire was distributed to NMI members of the working group on their activities relating to organic pure substance materials, and the requirements for an international programme in this area. |
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| But I hear you saying, and it's been a common thread, that adverse reactions and data supporting those reactions exist, either with the pure substance or because it's not pure. |
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| Following consultation with experts from the CCQM, a programme of work in the field of organic pure substance reference materials will be undertaken. |
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| In particular, in the case of entries which are mixtures of substances or substances described with a specific percentage purity, the limits apply to the substance as described in Annex I and not the pure substance. |
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| A pure substance is one which is composed of one kind of atom or molecule. |
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| Sodium cyclamate is a chemically pure substance. |
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| Mixtures and preparations shall be treated in the same way as the pure substance unless they no longer exhibit equivalent properties and are not capable of producing transboundary effects. |
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| A chemical substance, also known as a pure substance, is a form of matter that has constant chemical composition and characteristic properties. |
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| However, there are also tautomers, where isomerization occurs spontaneously, such that a pure substance cannot be isolated into its tautomers. |
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| The specific heat of any pure substance is the amount of heat required to raise the temperature of a unit mass of that substance by one degree on a given temperature scale. |
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| The heat of vaporization of any pure substance is the amount of heat required to change a unit mass of that substance, once brought to the boiling point, from liquid to gas. |
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| The melting point of any pure substance is the temperature at which, under common atmospheric pressure, that substance changes its state from solid to liquid. |
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